Cold cathode

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What Wikipedia says

A cold cathode is a cathode that is not electrically heated by a filament. A cathode may be considered "cold" if it emits more electrons than can be supplied by thermionic emission alone. It is used in gas-discharge lamps, such as neon lamps, discharge tubes, and some types of vacuum tube.

Excerpt from the Wikipedia article “Cold cathode”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Neotesla, CC BY-SA 3.0, via Wikimedia Commons.